EP3121836B1 - Dispositif de recuit par laser, procédé de fabrication de film de silicium polycristallin et film de silicium polycristallin fabriqué à l'aide dudit procédé - Google Patents

Dispositif de recuit par laser, procédé de fabrication de film de silicium polycristallin et film de silicium polycristallin fabriqué à l'aide dudit procédé Download PDF

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EP3121836B1
EP3121836B1 EP14882176.2A EP14882176A EP3121836B1 EP 3121836 B1 EP3121836 B1 EP 3121836B1 EP 14882176 A EP14882176 A EP 14882176A EP 3121836 B1 EP3121836 B1 EP 3121836B1
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laser
annealing
polycrystalline silicon
thin film
silicon thin
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German (de)
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EP3121836A4 (fr
EP3121836A1 (fr
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Xueyan Tian
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BOE Technology Group Co Ltd
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BOE Technology Group Co Ltd
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    • H01L21/02667—Crystallisation or recrystallisation of non-monocrystalline semiconductor materials, e.g. regrowth
    • H01L21/02675—Crystallisation or recrystallisation of non-monocrystalline semiconductor materials, e.g. regrowth using laser beams
    • H01L21/02686—Pulsed laser beam
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    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/0006—Working by laser beam, e.g. welding, cutting or boring taking account of the properties of the material involved
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    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/02—Positioning or observing the workpiece, e.g. with respect to the point of impact; Aligning, aiming or focusing the laser beam
    • B23K26/06—Shaping the laser beam, e.g. by masks or multi-focusing
    • B23K26/062—Shaping the laser beam, e.g. by masks or multi-focusing by direct control of the laser beam
    • B23K26/0622—Shaping the laser beam, e.g. by masks or multi-focusing by direct control of the laser beam by shaping pulses
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    • B23K26/06—Shaping the laser beam, e.g. by masks or multi-focusing
    • B23K26/064—Shaping the laser beam, e.g. by masks or multi-focusing by means of optical elements, e.g. lenses, mirrors or prisms
    • B23K26/0652—Shaping the laser beam, e.g. by masks or multi-focusing by means of optical elements, e.g. lenses, mirrors or prisms comprising prisms
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    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
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    • B23K26/06—Shaping the laser beam, e.g. by masks or multi-focusing
    • B23K26/064—Shaping the laser beam, e.g. by masks or multi-focusing by means of optical elements, e.g. lenses, mirrors or prisms
    • B23K26/066—Shaping the laser beam, e.g. by masks or multi-focusing by means of optical elements, e.g. lenses, mirrors or prisms by using masks
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    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/12—Working by laser beam, e.g. welding, cutting or boring in a special atmosphere, e.g. in an enclosure
    • B23K26/127—Working by laser beam, e.g. welding, cutting or boring in a special atmosphere, e.g. in an enclosure in an enclosure
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    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/352—Working by laser beam, e.g. welding, cutting or boring for surface treatment
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    • H01L21/02675—Crystallisation or recrystallisation of non-monocrystalline semiconductor materials, e.g. regrowth using laser beams
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    • H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer
    • H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic Table or AIIIBV compounds with or without impurities, e.g. doping materials
    • H01L21/26—Bombardment with radiation
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    • H01L27/02—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having potential barriers; including integrated passive circuit elements having potential barriers
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    • H01L27/1214—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having potential barriers; including integrated passive circuit elements having potential barriers the substrate being other than a semiconductor body, e.g. an insulating body comprising a plurality of TFTs formed on a non-semiconducting substrate, e.g. driving circuits for AMLCDs
    • H01L27/1259—Multistep manufacturing methods
    • H01L27/127—Multistep manufacturing methods with a particular formation, treatment or patterning of the active layer specially adapted to the circuit arrangement
    • H01L27/1274—Multistep manufacturing methods with a particular formation, treatment or patterning of the active layer specially adapted to the circuit arrangement using crystallisation of amorphous semiconductor or recrystallisation of crystalline semiconductor
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    • H01L27/12—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having potential barriers; including integrated passive circuit elements having potential barriers the substrate being other than a semiconductor body, e.g. an insulating body
    • H01L27/1214—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having potential barriers; including integrated passive circuit elements having potential barriers the substrate being other than a semiconductor body, e.g. an insulating body comprising a plurality of TFTs formed on a non-semiconducting substrate, e.g. driving circuits for AMLCDs
    • H01L27/1259—Multistep manufacturing methods
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    • H01L27/1285—Multistep manufacturing methods with a particular formation, treatment or patterning of the active layer specially adapted to the circuit arrangement using crystallisation of amorphous semiconductor or recrystallisation of crystalline semiconductor using control of the annealing or irradiation parameters, e.g. using different scanning direction or intensity for different transistors
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    • B23K2103/00—Materials to be soldered, welded or cut
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Definitions

  • the invention relates to the technical field of laser annealing, in particular, to a laser annealing device, a production process of a polycrystalline silicon thin film.
  • the active matrix organic light emitting diode (simply referred to as AMOLED) becomes an optimal choice of the display technique in the future due to advantages such as high image quality, short motion picture response time, low energy consumption, wide view angle, being ultralight and ultrathin, and the like.
  • excimer laser annealing (simply referred to as ELA), solid phase crystallization, metal-induced crystallization, or the like is a mostly applied method for producing the polycrystalline silicon layer.
  • ELA excimer laser annealing
  • solid phase crystallization solid phase crystallization
  • metal-induced crystallization or the like
  • the excimer laser annealing process is a relatively complex annealing process.
  • An ELA device is a device that irradiates an amorphous silicon film on a substrate with an excimer laser beam for a short time to produce a polycrystalline silicon film by the recrystallization of the amorphous silicon film.
  • the annealing device comprises a laser generator (not shown in Fig. 1 ), an annealing window 2, and two light-cutting plates 1 oppositely provided above the annealing window 2.
  • the end of the light-cutting plate, which reflects the laser beam is referred to as the "light-cutting end”.
  • the ingoing beam 40 arrives at the amorphous silicon thin film 3 through the annealing window 2.
  • the incident beam 41 arriving at the light-cutting plates 1 is reflected by the light-cutting plates 1, so that reflected beams 42 are formed.
  • the travel direction of the ingoing beam 40 and that of the incident beam 41 are substantially the same.
  • the included angle formed by the reflecting surface of the light-cutting plate 1 and the incident beam 41 is close to a right angle, the included angle ⁇ formed by the reflected beam 42 and the ingoing beam 40 is very small. Because the vibration direction of the reflected beam 42 and that of the ingoing beam 40 are similar, the phenomenon of interference will occur. This results in that there is interference mura on the produced polycrystalline silicon thin film. Such interference mura will affect the quality of the polycrystalline silicon. Meantime, in the manufacturing process, if interference mura on the polycrystalline silicon thin film occurs in succession, the percent of pass in the production process will finally decrease.
  • the polycrystalline silicon thin film produced by the ELA device in the prior art can have interference mura, which results in the decrease of the percent of pass of the product.
  • US2005/0169330 A1 discloses a laser annealing apparatus, in which a rectangular opening slit 11 is provided.
  • the rectangular opening slit 11 adjusts the long dimension of the shaped laser beam 3 to a predetermined size.
  • the shaped laser beam 3 is shaped by the beam shaper 10 into a long and narrow beam.
  • the power density in the shaped laser beam is not even.
  • the shaped beam is not a parallel beam.
  • This beam must be further adjusted by an image lens 14, before it may be used on the substrate
  • US2013/0087547 discloses a laser annealing apparatus comprising an annealing chamber and an annealing window through which the laser passes.
  • the object of the invention is to provide a laser annealing device, a production process of a polycrystalline silicon thin film, and a polycrystalline silicon thin film produced by the same, in order to reduce interference mura on a polycrystalline silicon thin film, and furthermore, to improve the percent of pass of the product.
  • An embodiment of the invention provides firstly a laser annealing device according to claim 1.
  • a laser annealing device comprising an annealing chamber, in which a laser generator is provided, wherein an annealing window, through which the laser passes, and two light-cutting plates oppositely provided above the annealing window are also provided in the annealing chamber, wherein a light-cutting end face of each of the light-cutting plates is a wedge-shaped end face.
  • a wedge-shaped end face indicates that the thickness exhibits a tend of increase from the side away from the main body of the light-cutting plate (i.e. the side of the light-cutting end) to the side close to the main body of the light-cutting plate, and the upper surface of the wedge-shaped end face (i.e. the surface irradiated by the laser) is provided slantwise, with respect to the plane, in which the annealing window lies.
  • the light-cutting end face employs a wedge-shaped end face, whose sectional structure is similar to a nib, the included angle formed by the reflected beam, which is formed by the reflection of the incident beam arriving at the light-cutting end face, and the ingoing beam, which passes through the annealing window, is relatively large, and the vibration directions of them differ relatively greatly.
  • the phenomenon of interference will hardly occur, and thus the interference mura generated on the polycrystalline silicon thin film due to the interference is reduced, the quality of the polycrystalline silicon thin film is improved, and the percent of pass of the product is also increased.
  • the light-cutting plate employs a wedge-shaped end face, which results in that the contact point between the light-cutting plate and the annealing window below moves outwards, and thus the contact face between the light-cutting plate and the annealing window is reduced, the abrasion of the annealing window is weakened, and the life time of the annealing window is increased.
  • the wedge-shaped end face has various structures.
  • the wedge-shaped end face in one option, is two planes forming an included angle and wherein, the upper plane (i.e. the surface irradiated by the laser) in said two planes forming the included angle and the plane, in which the annealing window lies, form an included angle of 40 to 50 degrees.
  • the included angle formed by the incident light and the reflected light is about between 80 to 100 degrees.
  • the vibration direction of the ingoing beam passing through the annealing window and that of the reflected beam are nearly perpendicular to each other.
  • wedge-shaped light-cutting end faces can also be used.
  • the wedge-shaped end face is, in an alternative option, a semielliptic cylinder or a parabolic cylinder.
  • the wedge-shaped end face can also be a semicylinder.
  • the laser generator can be an excimer laser.
  • the excimer laser is a xenon chloride excimer laser, a krypton fluoride excimer laser or an argon fluoride excimer laser.
  • the laser annealing device further comprises a supporter, which is positioned at the bottom of the annealing chamber, for supporting a substrate.
  • An embodiment of the invention also provides a production process of a polycrystalline silicon thin film, wherein the production process comprises forming an amorphous silicon thin film on a substrate; and subjecting the amorphous silicon thin film to laser annealing with any of the laser annealing devices mentioned above, so as to form a polycrystalline silicon thin film.
  • the interference mura on the polycrystalline silicon thin film is reduced by modifying the shape of the end face of the light-cutting plate.
  • the modification of the end face of the light-cutting plate is simple and costs very little.
  • Polycrystalline silicon produced by this process is particularly suitable for the manufacture and production of low temperature poly-silicon (simply referred to as LTPS) AMOLED. This process effectively reduces the phenomenon of interference mura on polycrystalline silicon thin films, which tends to occur in the LTPS-AMOLED in the prior art.
  • the impulse frequency of the laser is 500 Hz
  • the overlap ratio is 92% to 98%
  • the scanning speed of the laser is 4mm/s to 16mm/s
  • the energy density of the laser is 300 to 500 mJ/cm 2 .
  • the polycrystalline silicon thin film produced by any of the production processes mentioned above can be used as an active layer of a polycrystalline silicon thin film transistor. It is applicable in the fields of low temperature poly-silicon thin film transistor liquid crystal displays (simply referred to as LTPS TFT-LCD), active matrix organic light emitting diode displays, and the like.
  • the invention provides a laser annealing device, a production process of a polycrystalline silicon thin film, and a polycrystalline silicon thin film produced by the same.
  • the light-cutting end face is a wedge-shaped end face
  • the included angle formed by the reflected beam, which is formed by the reflection of the incident beam arriving at the light-cutting end face, and the ingoing beam, which passes through the annealing window, is relatively large, and the vibration directions of them differ relatively greatly.
  • the laser annealing device comprises an annealing chamber, in which a laser generator (not shown in Fig. 2 ) is provided, wherein an annealing window 2, through which the laser passes, and two light-cutting plates 11 oppositely provided above the annealing window 2 are also provided in the annealing chamber, wherein the light-cutting end face of each of the light-cutting plates 11 is a wedge-shaped end face.
  • the laser from the laser generator can arrive at the annealing window 2 and the light-cutting plate 11 after the laser beam has been adjusted by an optical system. Since the laser beam is nearly a parallel beam, the travel direction of the incident beam 41 arriving at the annealing window 2 and that of the ingoing beam 40 arriving at the light-cutting plate 11 are almost the same. In technical solutions of the invention, since the light-cutting end face employs a wedge-shaped end face, whose sectional structure is similar to a nib, the included angle formed by the reflected beam 42, which is formed by the reflection of the incident beam 41 arriving at the light-cutting end face, and the ingoing beam 40, which passes through the annealing window 2, is relatively large.
  • the vibration direction of the reflected beam 42 and that of the ingoing beam 40 differ relatively greatly.
  • the phenomenon of interference will hardly occur, and thus the interference mura generated on the polycrystalline silicon thin film due to the interference is reduced, the quality of the polycrystalline silicon thin film is improved, and the percent of pass of the product is also increased.
  • the light-cutting plate 11 employs a wedge-shaped end face, which results in that the contact point between the light-cutting plate and the annealing window 2 below moves outwards, and thus the contact face between the light-cutting plate 11 and the annealing window 2 is reduced, the abrasion of the annealing window 2 is weakened, and the life time of the annealing window 2 is increased. Because the annealing window 2 is an expensive consumable article, the maintenance costs of the laser annealing device are also reduced.
  • the wedge-shaped end face has various structures, such as a structure formed from the side faces of a prismoid, from two intersectant planes, or from other curved surface.
  • the wedge-shaped end face is two planes forming an included angle.
  • the two planes can be symmetrical with respect to a symmetry plane parallel to the upper face of the light-cutting plate 11.
  • the two planes can also be asymmetrical, as long as the two planes form an included angle.
  • the upper plane in the two planes forming an included angle and the plane, in which the annealing window 2 lies form an included angle ⁇ of 40 to 50 degrees.
  • the included angle ⁇ formed by the incident beam 41 arriving at the light-cutting end face of the light-cutting plate and the reflected beam 42 is about between 80 to 100 degrees.
  • the vibration direction of the ingoing beam passing 40 through the annealing window and that of the reflected beam 42 are nearly perpendicular to each other.
  • the incident beam 41 and the reflected beam 42 form an included angle of about 90 degrees, and the vibration direction of the ingoing beam 40 is nearly perpendicular to that of the reflected beam 42.
  • the wedge-shaped end face is a semielliptic cylinder or a parabolic cylinder.
  • the wedge-shaped end face can also be a semicylinder, or the like. It is apparent that the wedge-shaped end face can also be in other forms, as long as the height exhibits a tend of increase from the side away from the main body of the light-cutting plate 11 to the side close to the main body of the light-cutting plate 11.
  • the laser generator can be an excimer laser.
  • the excimer laser is a xenon chloride excimer laser, a krypton fluoride excimer laser or an argon fluoride excimer laser.
  • the laser annealing device further comprises a supporter, which is positioned at the bottom of the annealing chamber, for supporting a substrate.
  • a supporter for supporting a substrate can be provided.
  • an amorphous silicon thin film 3 which forms a polycrystalline silicon thin film upon laser annealing.
  • An embodiment of the invention also provides a production process of a polycrystalline silicon thin film.
  • Fig. 3 which is a schematic flow chart of the production process of a polycrystalline silicon thin film according to one embodiment of the invention, the production process comprises
  • the interference mura on the polycrystalline silicon thin film is reduced by modifying the shape of the end face of the light-cutting plate and designing the end face of the light-cutting plate as a wedged-shaped end face.
  • the modification of the end face of the light-cutting plate is simple and costs very little.
  • Polycrystalline silicon produced by this process is particularly suitable for the manufacture and production of LTPS-AMOLED. This process effectively reduces the phenomenon of interference mura on polycrystalline silicon thin films, which tends to occur in the LTPS-AMOLED in the prior art.
  • the impulse frequency of the laser is 500 Hz
  • the overlap ratio is 92% to 98%
  • the scanning speed of the laser is 4mm/s to 16mm/s
  • the energy density of the laser is 300 to 500 mJ/cm 2 .
  • laser parameters is designed to allow better conversion of the amorphous silicon thin film into the polycrystalline silicon thin film.
  • the laser parameters can be designed for excimer lasers.
  • the process further comprises forming a silicon nitride layer on the substrate and forming a silica layer on the silicon nitride layer.
  • the amorphous silicon thin film is positioned on the silica layer.
  • the polycrystalline silicon thin film produced by any of the production processes mentioned above can be used as the active layer of the polycrystalline silicon thin film transistor. It is applicable in the fields of LTPS TFT-LCD, active matrix organic light emitting diode displays, and the like. Said displays can be liquid crystal display apparatuses, TVs, computers, cellphones, and the like.
  • the excimer laser used in the invention can be a xenon chloride excimer laser, a krypton fluoride excimer laser, an argon fluoride excimer laser, or the like.
  • a xenon chloride excimer laser with a wavelength of 308 nm was used.
  • a specific process for producing the low temperature polycrystalline silicon thin film in the invention is as follows.
  • the polycrystalline silicon thin films produced by means of the light-cutting plate in the prior art which has the shape of a flat sheet, have stripe-like interference mura at the region where the edge of the laser beam irradiates the polycrystalline silicon thin film, as observed with a microscope.
  • the polycrystalline silicon thin film substrates produced by the process mentioned above do not exhibit interference mura.
  • the excimer laser beam passes through the light-cutting plates having a light-cutting end face of wedge-shaped light-cutting end face.
  • the included angle formed by the vibration direction of the ingoing beam and that of the outcoming beam is relatively large, which effectively prevents the phenomenon of interference between the ingoing beam and reflected beam, thereby preventing the interference mura that is generated in the polycrystalline silicon thin film on the substrate due to interference.
  • the contact point between the light-cutting plate having a wedge-shaped end face and the annealing window below moves outwards, and thus the abrasion of the annealing window is weakened, and the life time of the annealing window is increased.

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Claims (6)

  1. Dispositif de recuit laser comprenant
    une chambre de recuit dans laquelle est prévu un générateur laser,
    une fenêtre de recuit (2) traversée par un laser (40), et
    caractérisé par deux plaques de découpe par lumière (11) prévues face à face au-dessus de la fenêtre de recuit (2) et également prévues dans la chambre de recuit, une face d'extrémité de découpe par lumière de chacune des plaques de découpe par lumière (11) étant une face d'extrémité en forme de coin,
    la face d'extrémité en forme de coin étant constituée de deux plans formant un angle inclus, le plan supérieur parmi les deux plans qui forment un angle inclus et le plan dans lequel se trouve la fenêtre de recuit (2) formant un angle inclus de 40 à 50 degrés ; ou
    la face d'extrémité en forme de coin étant un demi-cylindre, un cylindre semi-elliptique ou un cylindre parabolique.
  2. Dispositif de recuit laser selon la revendication 1, dans lequel le générateur de laser est un laser à excimère.
  3. Dispositif de recuit laser selon la revendication 2, dans lequel le laser à excimère est un laser à excimère au chlorure de xénon, un laser à excimère au fluorure de krypton ou un laser à excimère au fluorure d'argon.
  4. Dispositif de recuit laser selon la revendication 1, le dispositif de recuit laser comprenant en outre un support, lequel est positionné au fond de la chambre de recuit, pour supporter un substrat.
  5. Procédé de production d'un film mince de silicium polycristallin, dans lequel le procédé de production comprend
    la formation d'un film mince de silicium amorphe sur un substrat ; et
    la soumission du film mince de silicium amorphe à un recuit laser à l'aide du dispositif de recuit laser selon l'une quelconque des revendications 1 à 4, de manière à former un film mince de silicium polycristallin.
  6. Procédé de production selon la revendication 5, dans lequel, pendant le recuit laser, la fréquence d'impulsion du laser est de 500 Hz, le rapport de recouvrement est de 92 à 98 %, la vitesse de balayage du laser est de 4 à 16 mm/s, et la densité d'énergie du laser est de 300 à 500 mJ/cm2.
EP14882176.2A 2014-03-17 2014-12-29 Dispositif de recuit par laser, procédé de fabrication de film de silicium polycristallin et film de silicium polycristallin fabriqué à l'aide dudit procédé Active EP3121836B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201410099177.1A CN103915318A (zh) 2014-03-17 2014-03-17 激光退火设备、多晶硅薄膜及其制作方法
PCT/CN2014/095313 WO2015139498A1 (fr) 2014-03-17 2014-12-29 Dispositif de recuit par laser, procédé de fabrication de film de silicium polycristallin et film de silicium polycristallin fabriqué à l'aide dudit procédé

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EP3121836A1 EP3121836A1 (fr) 2017-01-25
EP3121836A4 EP3121836A4 (fr) 2017-11-15
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KR101862088B1 (ko) * 2016-03-03 2018-05-30 에이피시스템 주식회사 Ela 공정용 레이저 빔 조절 모듈
CN106932944B (zh) * 2017-04-28 2020-06-30 上海天马有机发光显示技术有限公司 一种显示面板及其制作方法
CN107421916B (zh) * 2017-05-02 2021-02-23 京东方科技集团股份有限公司 检测装置、工艺***和检测方法
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CN115890021B (zh) * 2023-01-05 2023-05-16 成都功成半导体有限公司 一种晶圆激光切割方法及晶圆

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US20160254151A1 (en) 2016-09-01
WO2015139498A1 (fr) 2015-09-24
EP3121836A4 (fr) 2017-11-15
EP3121836A1 (fr) 2017-01-25
US10020194B2 (en) 2018-07-10
CN103915318A (zh) 2014-07-09

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